package com.yilin.medical.utils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.widget.Toast;

/**
 * 
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 * 
 * 
 * 
 * 
 * */

public class CrashHandlerUtil implements UncaughtExceptionHandler {

	public static final String TAG = "CrashHandler";

	// 系统默认的UncaughtException处理类

	private Thread.UncaughtExceptionHandler mDefaultHandler;

	// CrashHandler实例

	private static CrashHandlerUtil INSTANCE = new CrashHandlerUtil();

	// 程序的Context对象

	private Context mContext;

	// 用来存储设备信息和异常信息

	private Map<String, String> infos = new HashMap<String, String>();

	// 用于格式化日期,作为日志文件名的一部分

	private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

	/**
	 * 保证只有一个CrashHandler实例
	 */

	private CrashHandlerUtil() {
	}

	/** 获取CrashHandler实例 ,单例模式 */

	public static CrashHandlerUtil getInstance() {

		return INSTANCE;

	}

	/** * 初始化 * * @param context */

	public void init(Context context) {

		mContext = context;

		// 获取系统默认的UncaughtException处理器

		mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();

		// 设置该CrashHandler为程序的默认处理器

		Thread.setDefaultUncaughtExceptionHandler(this);

	}

	/**
	 * 
	 * 当UncaughtException发生时会转入该函数来处理
	 */

	@Override
	public void uncaughtException(Thread thread, Throwable ex) {

		if (!handleException(ex) && mDefaultHandler != null) {

			// 如果用户没有处理则让系统默认的异常处理器来处理

			mDefaultHandler.uncaughtException(thread, ex);

		}

		else {

			try {

				Thread.sleep(3000);

			}

			catch (InterruptedException e) {

				JxLogUtil.e(TAG, "error : ");

			}

			// 退出程序

			android.os.Process.killProcess(android.os.Process.myPid());

			System.exit(1);

		}

	}

	/**
	 * 
	 * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
	 * 
	 * 
	 * 
	 * @param ex
	 * 
	 * @return true:如果处理了该异常信息;否则返回false.
	 */

	private boolean handleException(Throwable ex) {

		if (ex == null) {

			return true;

		}

		// 使用Toast来显示异常信息

		new Thread() {

			@Override
			public void run() {

				Looper.prepare();

				Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_LONG)
						.show();

				Looper.loop();

			}

		}.start();

		// 收集设备参数信息

		collectDeviceInfo(mContext);

		// 保存日志文件
		saveCrashInfo2File(ex);

		return true;

	}

	/**
	 * 
	 * 收集设备参数信息
	 * 
	 * @param ctx
	 */

	public void collectDeviceInfo(Context ctx) {

		try {

			PackageManager pm = ctx.getPackageManager();

			PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),
					PackageManager.GET_ACTIVITIES);

			if (pi != null) {

				String versionName = pi.versionName == null ? "null"
						: pi.versionName;

				String versionCode = pi.versionCode + "";
				infos.put("versionName", versionName);

				infos.put("versionCode", versionCode);

			}

		}

		catch (NameNotFoundException e) {

			JxLogUtil.e(TAG, "an error occured when collect package info");

		}

		Field[] fields = Build.class.getDeclaredFields();

		for (Field field : fields) {

			try {

				field.setAccessible(true);

				infos.put(field.getName(), field.get(null).toString());

				JxLogUtil.d(TAG, field.getName() + " : " + field.get(null));

			} catch (Exception e) {

				JxLogUtil.e(TAG, "an error occured when collect crash info");

			}

		}

	}

	/**
	 * 
	 * 保存错误信息到文件中
	 * 
	 * 
	 * 
	 * @param ex
	 * 
	 * @return 返回文件名称,便于将文件传送到服务器
	 */

	private String saveCrashInfo2File(Throwable ex) {

		StringBuffer sb = new StringBuffer();

		for (Map.Entry<String, String> entry : infos.entrySet()) {

			String key = entry.getKey();

			String value = entry.getValue();
			sb.append(key + "=" + value + "\n");

		}

		Writer writer = new StringWriter();

		PrintWriter printWriter = new PrintWriter(writer);

		ex.printStackTrace(printWriter);

		Throwable cause = ex.getCause();

		while (cause != null) {

			cause.printStackTrace(printWriter);

			cause = cause.getCause();

		}

		printWriter.close();

		String result = writer.toString();

		sb.append(result);

		try {

			long timestamp = System.currentTimeMillis();

			String time = formatter.format(new Date());

			String fileName = "crash-" + time + "-" + timestamp + ".log";
			if (Environment.getExternalStorageState().equals(
					Environment.MEDIA_MOUNTED)) {

				String path = Environment.getExternalStorageDirectory()
						+ "/crash/";

				File dir = new File(path);

				if (!dir.exists()) {

					dir.mkdirs();

				}

				FileOutputStream fos = new FileOutputStream(path + fileName);

				fos.write(sb.toString().getBytes());

				fos.close();
			}
			return fileName;

		} catch (Exception e) {

			JxLogUtil.e(TAG, "an error occured while writing file...");

		}

		return null;

	}

}
